Here is how to install most of the updates til may2016:
http://www.howtogeek.com/255435/how-to-update-windows-7-all-at-once-with-microsofts-convenience-rollup/
Here is how to fix windows update:
http://wu.krelay.de/en/2016-07.htm
Note: Windows update service must be stopped, before you install those. Also it's better to change windows update service startup type to manual(or disabled) before and change it back when all those updates are finished.